Varaždin, Croatia
Varaždin, Croatia

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Logozar R.,Polytechnic of Varazdin
Journal of Information and Organizational Sciences | Year: 2011

We present the modeling of dynamical systems and finding of their complexity indicators by the use of concepts from computation and information theories, within the framework of J. P. Crutchfield's theory of ε-machines. A short formal outline of the ε-machines is given. In this approach, the dynamical systems are analyzed directly from the time series that is received from a properly adjusted measuring instrument. The binary strings are parsed through the parse tree, within which morphologically and probabilistically unique subtrees or morphs are recognized as system states. The outline and precise interrelation of the information-theoretic entropies and complexities emanating from the model is given. The paper serves also as a theoretical foundation for the future presentation of the DSA program that implements the ε-machines modeling up to the stochastic finite automata level.


This article shows the method of ranking the factors in the study of efficiency and effectiveness of the process of quality management system certification compliant with the requirements of international standard ISO 9001. During the research of efficiency of the quality management systems certification process in enterprises of metal processing industry in Croatia, various impact factors that affect the certification process have been identified. Therefore, the issue arose whether each factor could be treated equally, i.e. whether there are factors that are more important and have a more pronounced effect and greater impact on the certification process. The survey collected the opinions of competent experts in certification institutions, i.e. of external auditors who are directly involved in the certification process, and the representatives of the quality of the companies that have certified the system for at least two years. After the data was collected, ranking of impact factors and analysis of results was conducted.


Tunjic D.,TUV Croatia d.o.o. | Maglic L.,Josip Juraj Strossmayer University of Osijek | Kondic Z.,Polytechnic of Varazdin | Kljajin M.,Josip Juraj Strossmayer University of Osijek | Kondic V.,Polytechnic of Varazdin
Tehnicki Vjesnik | Year: 2013

The paper presents the method of ranking the factors in the study of efficiency and effectiveness of the quality management system certification process which is aligned with the requirements of international standard ISO 9001. During research on the efficiency of the certification of quality management systems we came to the various influencing factors. Therefore, the question was whether to treat each factor equally or whether there are factors that are more important and have a more pronounced effect and greater impact on the certification process. For the study the opinions have been collected of competent experts from the certification institutions or external auditors directly involved in the certification process.


Mrvac N.,University of Zagreb | Tomisa M.,Polytechnic of Varazdin | Milkovic M.,Polytechnic of Varazdin
Technics Technologies Education Management | Year: 2010

This paper elaborates the development of a new higher educational model. In that model, the focus shifts from knowledge, skills and abilities to the way of acquiring knowledge, skills and abilities. There are three key differences between the existing system and the proposed new model: the new model has a built-in mechanism for unnecessary knowledge removal; unlike the present system, which is focused on the transfer of teachers' knowledge, the new model is aimed at students gaining their own knowledge; the present system is aimed at the learning content, while the new model is focused on the learning method.


Havas L.,Polytechnic of Varazdin | Medved V.,University of Zagreb | Sko C Ir Z.,University of Zagreb
Communications in Computer and Information Science | Year: 2015

Fast development of mobile ICT technologies enabled and imposed their implementation in business and sports. As mobile technologies enable quick two-way communication, independent of the present location of athletes, their trainer or expert hardware and software systems, it is significantly important to utilize the advantages of that kind of communication to maximize the chances of achieving excellent results in a specific training process. This paper shows one ORT (Online Running Trainer) system, which was developed for preparations of marathon runners. It describes algorithms for calculation of training equivalents of set and achieved trainings, which was used for the success analysis of every micro cycle of the training process. By using available telecommunication channels, ORT system communicates with users in real time. It analyses their performance and, if necessary, dynamically corrects their training parameters to achieve better results in needed moment. Described methods are verified on a selected sample of runners. © Springer International Publishing Switzerland 2015.


Tomisa M.,Polytechnic of Varazdin | Mrvac N.,University of Zagreb | Milkovic M.,Polytechnic of Varazdin
Technics Technologies Education Management | Year: 2012

The focus of research activities in this work is directed towards determination of qualitative criteria for the design of graphic products in the process of graphic communication, the formation of evaluation ranks for the quality of a graphic product design by consumers and experts in graphic design, and the correlation of these ranks using the Spearman's correlation. For this research, 10 design tasks were formed; they were executed by 64 participants of the Graphic Design course and evaluated by 5 graphic design experts and 64 consumers. The basic criteria for evaluating each of the ten tasks were the relevance of the design of graphic products; originality of design; and execution. As the evaluation process result (for all the tasks and criteria) two rankings were obtained: the expert rank and the consumer rank. By correlating these ranks by all criteria, it is confirmed that the proposed criteria for evaluation of the quality of graphic products design are universal according to the type of the evaluator, and that they contribute to the fuller evaluation of design quality of a graphic product.


Vusic D.,Polytechnic of Varazdin | Milkovic M.,Polytechnic of Varazdin | Mrvac N.,University of Zagreb
Technics Technologies Education Management | Year: 2012

The estimation of qualitative features of picture stimuli in graphics and cross-media reproduction systems is dependent on various geometrical and color characteristics of the stimulus. Specific combination of black color in conjunction with the primary colors in additive and subtractive synthesis, may lead to unwanted deviation in perception of color characteristics of the presented stimulus, due to psychophysical visual effect of neon color spreading. This is even more pronounced on regular geometrical structures that we encounter in the Ehrenstein model. In this paper we investigate the influence of the primary color stimuli selection in creation of test samples which are formed as regular geometrical structures, i.e. the Ehrenstein model of intensity of the neon color spreading effect. The results show that the use of black surround color of the primary stimuli causes a greater intensity of the neon color spreading effect, when compared with cases when a complementary surround color was used in the inserted segment of the primary stimuli.


Glavinic V.,University of Zagreb | Ljubic S.,University of Rijeka | Kukec M.,Polytechnic of Varazdin
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2011

Present day mobile applications are becoming increasingly pervasive and complex, involving sophisticated user interfaces and touchscreen-based interaction designs. Their overall acceptance is highly dependent on usability, hence there exists a strong need to make related usability issues an integral part of the mobile software development. In this paper we propose a touchscreen meta-testing model, a set of individual test cases which represents what we believe to be the basic aspects of usability, common to all touchscreen applications. The main goal of the meta-test is to provide relevant feedback on elementary mobile touchscreen interaction, and to use obtained results as important parameters and usability guidelines within the mobile software development process. Along with universal usability support for touchscreen mobile applications in general, this experimental framework can provide some additional benefits, related to different possible ways of both applying meta-test model and using its final outcomes. © 2011 Springer-Verlag.


Glavinic V.,University of Zagreb | Ljubic S.,University of Rijeka | Kukec M.,Polytechnic of Varazdin
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2010

In order to create high quality and easy-to-use mobile software, the process of mobile device applications (MDAs) development must be accommodated to usability challenges. As present-day MDAs mostly target smartphones, with touchscreen ones increasingly gaining popularity, the primary focus in improving this process should include support for usability awareness at the earliest possible development phase for this class of mobile devices. In this paper we propose a model interaction benchmark test providing both quantitative and qualitative usability feedback at the elementary touchscreen action level. © 2010 Springer-Verlag.


We elaborate on the design and time-space complexity of data structures and several original algorithms that resulted from the DSA program - a tool that simulates dynamical systems and produces their stochastic finite automata models according to the theory of ε-machines An efficient batch iteration algorithm generates the system points and their binary symbols, and stores them in circular buffers realized as class member arrays. The words extracted from the time series are fed into a dynamically created binary tree of selected height. The tree is then searched for morphologically and stochastically unique subtrees or morphs, by aid of an algorithm that compares (sub)trees by their topology and the descendant nodes' conditional probabilities. The theoretical analysis of algorithms is corroborated by their execution time measurements. The paper exemplifies how an implementation of a scientific modelling tool like the DSA, generates a range of specific algorithmic solutions that can possibly find their broader use.

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